How to change scroll line number in TTMSFMXMemo

FMX TMS FMX UI Pack
5

I updated TMS FMX pack to v3.6.3.0 and found it added the "WheelLineCount" property in TMSFMXMemo.

I tried to set it to 1:
   Memo->WheelLineCount = 1;
But it scrolls 13 lines.
In normal text editor, it usually scrolls 3 lines only.

C++ Builder 10.1 Berlin
32-bit Windows